I am doing something improperly with references, but I can't see it! This is the error I get.

Can't call method "gif" on an undefined value at test2.pl line 80.
That line is 3rd from the bottom on the snippet below.
this is the piece of code that generates the above error:

   my $data = GD::Graph::Data->new();
   my $graph = GD::Graph::bars->new();
   my $format = $graph->export_format;
   if ( $dbh = DBI->connect("DBI:ODBC:$INI{DSN}",$INI{DBuser},$INI{DBp
+ass}) ) { 
      my $gotdata = 0;
      my $stmt = 'SELECT SysID FROM MeterEvent WHERE Sysid >= 2 and Sy
+sid < = 10';
      if ( my $sth = $dbh->prepare($stmt) ) { 
         if ( my $rows = $sth->execute ) { 
            while (my @row = $sth->fetchrow_array) {
               $data->add_point(@row);
               $gotdata = 1;
            }
         } 
      } 
      $dbh->disconnect(); 
   } else {
    print "Database Error$br\n";
   }
   my $gd = $graph->plot($data);
   open(IMG, '>file.gif') or die $!;
   binmode IMG;
   print IMG $gd->gif;  # this is the line # 80
   if ( defined $gd ) { print " 4.gd defined\n"; } else {print " 4.gd 
+NOT defined\n"; }
   close IMG;
[download]

The GD::Graph::Data manual states the following in the examples section

  use GD::Graph::Data; 
  use GD::Graph::bars; 
  my $data = GD::Graph::Data->new(); 
  $data->read(file => '/data/sales.dat', delimiter => ','); 
  $data = $data->copy(wanted => [2, 4, 5]); 
  # Add the newer figures from the database 
  use DBI; 
  # do DBI things, like connecting to the database, statement 
  # preparation and execution 
  while (@row = $sth->fetchrow_array) 
  { 
          $data->add_point(@row); 
  } 
  my $chart = GD::Graph::bars->new(); 
  my $gd = $chart->plot($data);
[download]

Thanks for your help!

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